协优5968作单季晚稻栽培的移栽密度、氮肥用量和施氮时期研究

选择了移栽密度、追肥尿素用量及其在各处理用量下，追肥尿素在分蘖肥和保花肥上的分配比例等3个试验因子，采用单形格子设计，布置田间参数试验，建立了3个供试因子对于产量的回归数学模型，经对模型的解析，并结合生产实际认为，在本试验条件下，协优5968的移栽密度为0．9万丛／667m^2左右，追肥尿素用量26kg／667m^2左右，其中移栽后10d以60％左右的用量作分蘖肥，在主茎倒2叶露尖时，以40％左右的用量作保花肥施用。

Research on the Transplanting Density and Technology of Spreading Nitrogen While Xieyou 5968 Planted as Single Cropping Late Hybrid Rice

The research chose three testing factors, which were transplanting density , the amount of topdressing urea and the distributive proportions of urea as tiller fertilizer and spike] et -developing fertilizer under their treated amounts, adopting simplex - lattice design and setting field parameter tests. Three testing factors and the corresponding regression mathematical models were established. Analyzing the models together with the productive practice, it is believed perfect that under this testing condition the transplanting density of Xieyou 5968 is 9000 clusters/667 m^2 ,that the amount of Topdressing urea is 26 kg/667 m^2, 60% of which is tiller fertilizer used 10 days after transplanting and about 40% of which is used as spike] et -developing fertilizer.